Tool retainer



Sept. 30, 1930. w. G. NAlsMlTl-l 1,775,922

TOOL RETAINER Filed Sept. 27, 1927 3 Sheets-Sheet l ill! Ulli?,

Sept. 30, 1930. w. G. NAlsMlTH TOOL RETAINER iled sept. 27, 1927- ssheets-sheet s @Hornung Patented Sept. 30,1930

' UNITED vvSTATES.

PATENTOFHCE WILLIAM G. NAISMITH, or DENVER, COLORADO, AssIGNOR To THRGARDNERDENVRR COMPANY, OF DENVER, COLORADO, A CORPORATION or DELAWARE,

' TOOL Y RETAINER Application filed September 27,1927. serial N.222,293;

The present inventiony relates to tool retainers for drilling machinesand the like, the obj ect being to provide a simple structure that canbe readily applied to the implement and 5 will constitute anyetlfectiveretainer for the tool, while allowing it necessary limited play.

In the accompanying'drawings: Figure 1 is a side elevation of thepreferred embodiment ofthe invention,

Figure 2 is a top plan view, vFigure, 3 is a front elevation,

Figure 4`is`a cross sectional View on the line 44 of Figure 1, 1

Figure 5 is a longitudinal sectional view on 15 the line 54-5 of Figure2,

Figure6 is a sectional View on the line 6-6 of Figure 5,

Figure 7 is `a detail sectional view onthe line 7-7 of Figure 1, s y

collar,

Figure 9 is a front elevation of the same, Figure 10 is a sideelevation, Figure 11 is a rear elevation of said mounting collar.

in Figure 6. v

A mounting member, comprising a collar 15, is employed that isinternally threaded,

and is screwed on the' threadedportion 13 of the chuck housing ortool-receiving member.

This collar has an annular exlternalfgroove 16 in its rear end that isintersected by slots 17. hen the collar is threaded on to thetool-receiving member 12, one of these slots 17 is alined with thesocket 14 and a pin 18 is placed in the socketv14 and projects into theslot 17, as shown in Figure 6. The collar is thus held against turning,and the pin is retained in place by a spring ring 19 engaged in thegroove 16 and covering the outer end of said pin 18. The collarfurthermore has` a longitudinally disposed slot 20 extending from thefront end nearly to the annular groove 16. Consequently the front endportion of the collar can be contracted and a contracting bolt 21bridges the slot 20 for the Figure 8 isl a top plan view of the mountingpurpose of clamping the collar firmly onfthe tool-receiving member 12.`Obviously therefore the collar is rigidly and eifectively pos tionedagainst accidental displacement.

' The vcollar is provided .atfits rear end portion and at one side withoppositely extending integral trunnions 22, and further has on itsopposite sides sets of spaced stop` lugs 23 and 24, the lugs 23 acting`as abutments, the lugs 24 constituting lockingelements. A retainingyoke is designated 25, and is of U- shape, so arranged thatwhen inoperative position, it extends transversely in front of the mountingcollar 15 and the tool-receiving member 12. The openside of this yokefaces the sameside as that carrying the trunnions 22. Side arms areprovided for the yoke and Vare substantially S-shaped. The rear endportions 26 of these side arms terminate in` eyes 27 that surround thetrunnions 22 and form a pivotal mounting for the yoke. These portions26, when the yokeis in its operative position, extend transversely ofthe mounting collarV 15 and engage between the lugs 23 and 24.

The .tool is shown at 248 and is provided with the usual collar 29. YWhen the tool is in position and theyokeis in its operative position, itwill embrace the shank of the tool' 28 in advance of the collar 29, inwhich case, as shown in Figure 1, the portions 26 of the side arms arebetween the lugs 23 and 24. The yoke is thus effectively held in itsoperative position, but Vbecause of its formation, it is capable ofyielding'if subjected'to blows from the collar of the tool 28. Toreleasethe tool and permit itsremoval, it is only necessary to swing the yokedownwardly, the portions 26 ot' the side arms riding over the roundedlugs 24 and allowing the yoke to drop or swing to a position alongsidethe collar.

It will be clear that this device is a simple and effective toolretainer and can be manufactured, assembled and mounted in assembledcondition on the tool-receiving chuck or member.

v From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it Will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted to Without departing from thespirit or sacrificing any of the advantages of the invention.

IVhat I claim, is

The combination with a threaded tool-receiving member, of a splitcontractile mounting collar threaded on the member and having oppositetrunnions on one side and sets of stop lugs on opposite sides alongsidethe trunnions, means for contracting the collar and holding it againstturning on the member, and a tool retaining yoke in advance of thecollar and having an open side that opens to the side of the collarhaving the trunnions, said yoke having substantially S-shaped side arms,the terminal portions or" Which extend transversely to `and on oppositesides of the collar and are pivotally mounted on the trunnions, saidterminal portions detachably engaging with the lugs.

In testimony whereof, I aiix my signature.

WILLIAM G. NAISMITH.

